new failures on windows?

[c-cube]

since 4.13 was released, I've started seeing this kind of failure, where setup-ocaml tries to install ocaml 4.13 but fails (even on switches explicitly using another version of the compiler).

[shonfeder]

We are seeing the same kind of failure, but for 4.12:

ocaml-variants = 4.12.1+mingw64c no matching version

https://github.com/ocaml/omd/pull/254/checks?check_run_id=3710546953#step:3:589

[dra27]

For 4.13, it's (genuinely!) great that systems are so ready the weekend after the release! Unfortunately, that's caught us out slightly with discontinuation of fdopen/opam-repository-mingw.

This affects 4.12.1 and 4.13.0 - it should be temporarily possible to work around this by forcing 4.12.0 for Windows in your build matrix and removing 4.13.0.

I'm in the process of sorting out the formal upstreaming of Windows support to ocaml-base-compiler in ocaml/opam-repository (actually working on it yesterday, as part of a demo for cloneable compiler for opam on Tuesday), but I'll try to put a temporary update of the patches together for setup-ocaml to use either this evening or tomorrow.

[smorimoto]

In the short term, fdopen/opam-repository-mingw@2b57e0d should have fixed things. In the long term, I will fix this with #263...

[smorimoto]

The new release contains a fix for this issue. So it will not happen in future releases. Thanks for the report!

[shonfeder]

Thanks for the fix!